I just bought a 1964 tbird, started right up and ran beautifully. Needed a jump however since battery was so old. Drove it for about 40 miles before it died on me. luckily i only lived about 5 miles away so i got it towed. I thought it was clear that i needed a new battery. Got a new one from the O'Rilies and slapped it in. Started right up, thought i was done. Let it warm up, thought about taking it on a drive to make sure it wouldn't die and to fill up on gas. Thankfully i didn't because i turned it off to run inside my house to get my wallet and it didn't start back up after that. Tried to tighten the battery connectors because i didn't tighten them all the way and nothing, it just clicks. So i thought maybe starter; however, when i was messing around by trying to start it over and over to see if something would just click in place, it started to crank. The issue is i was pushing the button so fast that i let go before it could fully start if it would of started anyways. Couldn't replicate that again. Thought it was the neutral safety switch but i was told it wouldn't even click if it was. Im thinking maybe the relay? Im new to classic cars and its my first one i owned. it has a 390 motor with 23k og miles. Super clean, and loved the drive for as long as it lasted. Somebody please help. Not sure how the wiring should look coming off the battery, however maybe it was tampered with? Or maybe not. That may of been how things were in 64' lol.